Antiskid attachment



March 24-, 1953 ElsNER 2,632,491

ANTISKID ATTACHMENT Flld June 3, 1950 Ff. Z

Patented Mar. 24, 1953 UNI T E-D *s TATE s PATENT 2,632,491 r AN TISIKID ATTACHMENT Harold Eisner, Au Marronier, 'Prangins, Switzerland, assignor to' Hermann R. Raz-Ammanns Wwe. & 00., Thun, Switzerland Application June *3,1.1950, Serial N 0. 165,902.

.This: invention relates to anti-skid devices .or attachments for the wheels .of' automotive and similar-.vehiclesto prevent ame from'slipping or..skidding, preferably on icy and-muddy roads.

. ;It. is. one, of .theobjects of. the present invention to provide means affording the combination of resilient and improved gripping actionsinantiskid rdevices whereby; relative; movement between the elements of which such devices are composed may take place.

.It is another object .of the present invention to provide means ofiering the possibility of anchoring anti-sskid'meansron a relatively resilient base'or-carrier which inherently contains furtheranti-skid means of a character different from that of the first mentioned, anti-skid means.

Another object of the present invention is to provide means :tacilitating'the employment of thelnew anti-skid device on any size or type of tire to-whichit maybe readily applied and conformed-to fit theparticular shape thereof.

Still a ,further object or the present invention is to provide means ensuring ,suflicient' movability for the anti-skid. device so as to enable the same to follow the yieldability 'of 'the tire f :a svehicle particularlywhen in use."

Yet a further object of the present invention is. to provide means contributing to a substantial increase of the life of the vehicle tire, offering considerable resistance to highstresses and ensuring reliable construction and efficient operation of the ,antieskid structure.

Astill further object of the present; invention isto provide means permitting the accommodation of anti-skid elements ofvarious degrees of hardness ,or wear resistance in'the body or base of the anti-skid device.

:Still afurther object of the present invention is to provide means conducive to -a simplified anti-skidstructure of the aforesaid character which'may'b'e" easily manufactured by mass production methods and can be applied to extend across the treadsurfaceofatire-without damagingithexlatter; and to provide further means permitting the positioning of :the anti-skid :el'ements at predetermined location of the antiskid base or'bod'y, whereby the latter may be attachedto said tread surface of said tire; while the anti-skid elements or means are preferably arranged in-staggered relation to each other and relativelyto the tireyalthough only one and the same type and sl iapeeo'f the" anti s'kid structure 2 noise of anti-skid devices to a minimum and minimizing the friction Of Such devices 'With the tread surface of the tire of the vehicle. I

Another object of the invention resides in the provision of means enabling the manufacture of the base or body or the anti-skid device inde'-' pendent of the wear-resistant element or en; ments, which maybe readily associated with said body in accordance with the specific re quirements' of the practice, as to the load 'ofthe' vehicle, shape of the tire, character.6'f.the read (for example, mountain road) onwhic'h the'anti skid device is to be used, etc.

With the above and other objects'in view, "the invention will be hereinafter more fully idea scribed and the combination and arrangement of parts will be shown in the accompanying draw ing and pointed vout in the claims which form part of the specification.

In the drawing: Fig. .1, is a top plan View of an antiskid attachment 'made in accordance with this invention. r

Fig. .2 is a bottbifi plan View Of the attach merit or Fig. 1;.

Fig". 3 is a Side lvatiolfl'al View Of the" attachm at of Fig. 1. I I Fig. 4 Shows the aritie-s'kidattachmllt (if I as applied to a tire of an automobile.

Fig. '5 .is an enlarged view partly in section andtak en along-line 5- 5-of.Fig. 14. 3 Fig. 6 is aaernarge fragmentar .setionar view taken along line 6- 6 of. Fig. .1. 1 Referring now more paifimilall'yltb the, ing there is showniin Figs. .1 to 3 an anti-skid body 01 attachment [0 made principall of stretchable, preferably rubber .or other plastic material, and in ccdrdaneewitfitms. invention. anti-skid attachment consists principally of the .Ihediafi art II' afidc'th 'ifefisiofis of outerazas l2 and It. .The median et-runs reinforce at [4, relati ely to fihelbefidafile tensions I2 and r3. The upper siirface of i dian part I] is provided with a pliiral y of blockes'haped elements [5, lid terminate is opposed lateral ends. and are separated from As seenin Fig. .1 there has been provided on the longitudinalportion II' a larger rectangularshaped block l8 which is substantially df rth same height as the block f5, [5a but islarger than each of said blocks [5, 5a and forms an anchorage for as ntered' carbide alloy'elenient 3 This member passes through block 18 of median portion II and terminates at the underface 2| thereof whereby the rivet-like member I9 is retained by a securing ring 22 recessed at 22a with respect to underface 21, as can be seen from Fi 6.

The rivet-like member [9 has a conical end 23 which is held in position by said securing ring 22. It is well understood that tapered member 20 of carbide alloy is driven under friction into a suitable opening 24 of member l9 and is provided with a rounded head 25 which substantially conforms to the upper rounded surface 26 of rivet member l9.

As will be further seen from Fig. 1 there are eight blocks l5 arranged on one side of member 20 and four blocks I511 on the opposite side of member 20, all these blocks being positioned on the median portion ii of the anti-skid attachment.

As indicated in Fig. 1, the rubber extensions l2 and is may be provided with suitable perforations 2'5, 28, which may be brought in registry with each other and penetrated by rivets 29 as seen in Fig. 5, whereby end loops 3%! are obtained which are adapted to receive chain links 3|. Thus the anti-skid attachment It) may be placed over the tire Ml of a wheel of an automobile and anchored thereon laterally between chain links 3|.

Since the blocks I5 and 15a are arranged not symmetrically with respect to the carbide alloy metal member 29 it will be readily recognized from Figs. 4 and 5 that the anti-skid attachment bodies l may be arranged in alternate relation to each other on the tire 49, whereby the ends 25 of adjacent carbide alloy elements 29 will extend alternately a distance from the center line 32 of the tire as illustrated in Fig. and in staggered relation.

, It is self-understood that the perforations 21, 28 may be provided in the lateral extensions l2 and I3 a predetermined distance from each other to suit the particular requirements for anchoring the attachments. Consequently, the perforations 21 and 28 may be placed on any location along lateral extensions i2 and I3 and then brought in registry with each other for riveting purposes.

It is further to be mentioned that body I!) is preferably reinforced adjacent its base by a layer 33 of canvas or similar pliable reinforcing material 34 and it may further be mentioned that such canvas layers 33 may be provided in lengthwise direction of body I!) and at different levels thereof.

It goes without saying that the tread surface of the anti-skid attachment consisting of the blocks I'5, l5a, It) to 29, inclusive, may also form the tread surface of the tire itself, whereby the anti-skid element 29 may be arranged in spaced apart relation to each other along the surface of the tire.

"It can thus be'seen that there has been provided according to the invention a substantially flat body of compressible and stretchable material, one surface of said body being provided with a tread surface, and wear-resistant means of sintered carbide alloy anchored in said body, said tread surface including a plurality of blockshaped elements separated from each other at the level of said tread surface, said wear-resist,- ant means extending adjacent said block-shaped elements and projecting to said tread surface. It will be further noted that the tread surface may provide any suitable profiled area and that the blocks 15, I512 and [8 may assume various shapes and configurations, always keeping in mind that they provide a certain shape with respect to each other and with respect to the wearresistant anti-skid element or elements arranged intermediate on said block or blocks. 7

The element or shape 29 hereinabove referred to consists preferably of cemented or sintered hard metal carbide, such as cemented tungstencarbide base metal having a degree of hardness of approximately 78 Rockwell C (150 kg. load) corresponding to 88-99 Rockwell A kg. load).

It is well apparent that other hard metal carbides (made of cobalt, chromium, etc) may be employed and that tungsten carbide shape 20 may be embedded in or associated with the attachment it] in any other suitable manner.

Although the invention has been described with reference to a certain specific embodiment thereof, it is to be distinctly understood that various modifications and adaptations of the arrangement herein disclosed may be made as may readily ocur to persons skilled in the art without constituting a departure from the spirit and scope of the invention as defined in the objects and in the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. An anti-skid attachment comprising an elongated body of rubber material having outer extensions and a median portion having lateral ends, the surface of said median portion being grooved to form first and second groups of gripping blocks spaced from each other and separated by an anchoring block, and wear resistant means secured in said anchoring block and projecting beyond the outer surface of said gripping blocks and said anchoring block, said anchoring block being positioned ofi" center with respect to said median portion and intermediate the lateral ends thereof. a r

2. An anti-skid attachment comprising an elongated stretchable body having outer extensions and a median portion terminating in opposed lateral ends, the surface of said median portion being profiled to form first and second groups of gripping blocks spaced from each other, an anchoring block intermediate said gripping blocks, at least one rivet, said rivet having a tapered central bore and being carried by said anchoring block, and wear-resistant means embracingly received and supported within said tapered bore and projecting beyond the outer surface of said gripping blocks and said anchoring block, said anchoring block being positioned off center with respect to said median portion and said lateral ends thereof.

HAROLD EISNER.

REFERENCES CITED,

The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,167,277 Kaiser July 25, 1939 2,477,601 Hanson Aug. 2, 1949 2,498,523 Bergen Feb. 21, 1950 FOREIGN PATENTS Number Country Date 12,781 Great Britain 1906 325,322 7 Great Britain Feb. 20, 1930' 

